WhoSayWho? 5,000+ posts
Preston Caught a Predator
One of these days I am going to take the time to learn to compute appropriate box size on my own. I know that JL's recommended box sizes are different than the ones you just suggested. I am not saying you are right or wrong in this particular case (I just don't know).The RIGHT ported enclosure won't let you down either. That said most people don't have the space to put these in the right sealed enclosure and most end up in a ported box that is way too small and tuned way too high. A 32hz tuning results in a 3dB peak around 45hz. The sub wants a sub 25hz tuning to play flat. It also wants about 4 cf per driver.
However, I am under the impression that many companies underestimate the appropriate size box for their subs. I don't know whether this is for marketing purposes or what. Or perhaps the recommended size represents a compromise of some sort to fit the broadest range of listening tastes.
I recall once reading where Ologyaudio was discussing what size he felt should be used for BA's G5 sub. BA was saying 1^ sealed. Ology was saying that he would recommend puttting it in a much larger enclosure -- perhaps 2.2^ if I remember correctly.